Ivmwnotok



nietes tetra PATRICK V. DUNNQOF CALVAMUS, WISCONSIN. l

Letters Patent No. 62,945, dated M'arck 19, 1867. v

TO ALL WHOM IT MAY CONCERN: l

Be it known that I, PATRICK V. DUNN, of the town of Calamus, in the county of Dodge, and State of Wisconsin, have invented anew and improved Method of Holding Edged Tools upon Grindstones when in the process of being ground, reference being had to the accompanying drawings, making a part of this specification, in which- Figure 1 is a perspective view of `my invention, showing the manner of using it in grinding s'cythes.

Figure 2 is a perspective view of a part of my invention, showing the manner of holding diierent tools in the clamp on the grindstone.

This invention consists in providing grin'dstones with an additional frame, to be set upon a conimon frame to hold the clamp or device in which edge tools are fastened, so as to be held upon the stone in any vposition required; also a weight, which can be adjusted to give such pressure as may be desired of the toolto be ground upon the grindstone. y. l

In the accompanying drawingssimilar letters of reference indicate-corresponding parts in these figures. Letters A A represent the common frame. for holding the grindstone B. C C C represent the frame which I attach to the common frame of the grindstone for the pnrpose'of holding the clamp D; Letters E E represent the device for holding scythes, which may be readilyl removed, being confined to the clamp'by means of the.

screw F. Whenother tools are to be ground the device for holding scythes is removed and the tools to be ground placed within the jaws g g of the clamp D, Where it is Jrmly held by means of the thumb-screw H, as represented in fig. 2. The clamp D may be raised or lowered, set back or forward, as the kcase may be, and there secured by means of a pinthrougli the holes, as indicated, in the posts of the upper frame and the clamp, thus bringing the tool upon the stone in such a manner as to give. it the requiredrbevel. WhenA grinding axes, -gauges, or similar tools, the pin is removed from the clamp-handle, which enables the operator to handle the tool upon the stone so as to give it the required shape. The necessary force or pressure of the tool upon the stonev is produced by means of the weight I upon the lever J and wheel K.

What I claim as my invention, and desire to secure by Letters Patent, is`

1. The combination'and arrangement of the frame C C C, the clamp D, andthe scythe device E, substantially as described for the purposes specied.

2. The combination of the Weight I, lever J, and wheel K, as described for the purposes specified.

l. V. DUNN.

Witn csses:

LORENZO D. LrvnnMoRn, CnAs. W. RUSSELL. 

